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To make a 3 dimensional enclosure, multiply the litres figure the sub needs (in the instructions/spec leaflet) by 1000. Then divide it by the width in cm you'd like it to be, divide that by the height and you're left with the depth that it'd need to be.
Just make sure the height and width is enough to cope with the face of the sub and depth of the box can cope with the depth of the sub.
Add the sub displacement figure to your litres figure before you start unless you plan to mount it arse out and just play with the figures and measurements until you get a suitable shape. It can be any shape you like so long as the air volume remains the same.
Do a 13 inch sguare cube m8 and thats perfect, if you want it accurate, go to you're local b&q warehouse, they do woodcutting and it will be spot on, i work at b & q and we make speaker boxes all the time on our timber saw
yeh, straight lines are fine for a cube, but if you want to make elaborate shape boxes you will need a half decent jigsaw, i should know, made enough of em at b & q